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Monitor MongoDB With SNMP on Linux

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  • Overview
  • Considerations
  • Configuration Files
  • Procedure
  • Optional: Run MongoDB as SNMP Master

Note

Enterprise Feature

SNMP is only available in MongoDB Enterprise.

Overview

MongoDB Enterprise can provide database metrics via SNMP, in support of centralized data collection and aggregation. This procedure explains the setup and configuration of a mongod instance as an SNMP subagent, as well as initializing and testing of SNMP support with MongoDB Enterprise.

Tip

See also:

Troubleshoot SNMP and Monitor MongoDB Windows with SNMP for complete instructions on using MongoDB with SNMP on Windows systems.

Considerations

  • SNMP support is only available in mongod. Other MongoDB tools such as mongos do not support SNMP.

  • mongod does not support the use of SNMP traps.

Configuration Files

MongoDB Enterprise includes the following SNMP configuration files:

  • MONGOD-MIB.txt:

    The management information base (MIB) file that defines MongoDB's SNMP output. On Ubuntu and Debian platforms, this file is shipped compressed as MONGOD-MIB.txt.gz and must be decompressed with gunzip.

  • mongod.conf.subagent:

    The configuration file to run mongod as the SNMP subagent. This file sets SNMP run-time configuration options, including the agentXSocket to connect to the SNMP master.

  • mongod.conf.master:

    The configuration file to run mongod as the SNMP master. This file sets SNMP run-time configuration options, including the agentaddress to run on.

The MongoDB SNMP configuration files are provided with your MongoDB Enterprise installation, as follows:

  • If you installed MongoDB Enterprise via a package manager, these files are installed to the following directory as part of the package installation process:

    Platform
    Path
    RHEL / CentOS
    /usr/share/doc/mongodb-enterprise-server-4.4.25
    Ubuntu / Debian
    /usr/share/doc/mongodb-enterprise-server
    SUSE
    /usr/share/doc/packages/mongodb-enterprise-server

  • If you installed MongoDB Enterprise from a .tgz tarball, these files were included in the tarball.

Procedure

1

Copy configuration files.

Copy the MongoDB SNMP configuration files from their installation location to their target directories, according to your platform:

2

Configure SNMP.

This configuration defines a UNIX domain socket for communication between the master (snmpd) and sub-agent (MongoDB), and defines basic SNMP permissions for access to the relevant MongoDB SNMP fields.

Note

To bind your master to a non-localhost IP address, add that IP address to the agentaddress field in the /etc/snmp/snmpd.conf file, and update the appropriate network security ACLs to permit a valid address range. An address range of 10.0.0.0/8 with a security name of "mynetwork" has been provided in the mongod.conf.master configuration file as an example.

The above configuration is given as an example only; you may wish to customize permissions based on your site security requirements. While MongoDB support can provide guidance on configuring MongoDB for SNMP, configuring SNMP on operating systems is out of scope.

3

Start SNMP.

Start SNMP on your system using the initialization system appropriate for your version of Linux:

  • For Linux systems using systemd (systemctl command):

    sudo systemctl start snmpd

  • For Linux systems using System V init (service command):

    sudo service snmpd start
4

Start MongoDB.

Start mongod with the snmp-subagent to send data to the SNMP master.

mongod --snmp-subagent
5

Confirm SNMP data retrieval.

Verify that MongoDB is accessible for SNMP queries with the snmpwalk testing command.

The snmpwalk command should display current values for SNMP fields such as sysUpTime, and memoryResident, among others.

Note

The port used in the above snmpwalk testing command, port 161, is the default port for the snmpd service, not the primary port for the mongod. If you have configured a different port for your snmpd service, supply that here instead.

Optional: Run MongoDB as SNMP Master

You can run mongod with the snmp-master option for testing purposes. To do this, use the SNMP master configuration file instead of the subagent configuration file. From the directory containing the unpacked MongoDB installation files:

cp mongod.conf.master /etc/snmp/mongod.conf

Note

To bind your master to a non-localhost IP address, add that IP address to the agentaddress field in the /etc/snmp/mongod.conf file, and update the appropriate network security ACLs to permit a valid address range. An address range of 10.0.0.0/8 with a security name of "mynetwork" has been provided in the master configuration file as an example.

Then, start mongod with the snmp-master option:

mongod --snmp-master
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